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That rule of thumb doesn=E2=80=99t make a great deal of sense. There are =
two issues with oil that is changed frequently, as it usually is with =
racing engines. Low temperature means any water contamination won=E2=80=99=
t necessarily be driven off. If you exceed 212 degrees F with a vented =
wet sump engine most of the water will evaporate and vent. We have wet =
sleeve motors and iffy head gaskets=E2=80=94we get water in our oil. =
Mayonnaise doesn=E2=80=99t lube all that well.=20
If oil temperature exceeds 290 it starts to oxidize faster. Wet sump =
motors with moderate control over the crankcase oxidize oil pretty =
quickly. Frequent changes manage that, so who cares. Also above 290 we =
start seeing viscosity, and more importantly, film thickness decrease. =
Plain bearing motors and cams with plain followers like a thicker film.=20=
So more than 212 and less than 290 seems wise, and probably less than =
270 just to be conservative. But definitely more than 212
> On Feb 9, 2016, at 1:05 PM, Bill Tobin <william.tobin31@verizon.net> =
wrote:
>=20
> Hi Gang, there is a nice writeup about John Morton in the March =
edition of Sportscar, the SCCA magazine. He was at the Jefferson 500 =
last spring and seemed like a cool guy. I bought his book, complete with =
autograph.
> =20
> Also regarding oil coolers; a friend who's been racing since '66 told =
me as a rule of thumb the oil temp should be about 30 degrees above =
water temp.
> Also you can make up braided hoses rather easily yourself. Pegasus has =
a good description on how to do it in their catalog, along with a good =
selection of hoses and fittings.
> NFI.=20
> Cheers, Bill
> _______________________________________________
>=20
> http://www.fot-racing.com <http://www.fot-racing.com/>
>=20
> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
> Archive: http://www.team.net/archive <http://www.team.net/archive>
> Forums: http://www.team.net/forums <http://www.team.net/forums>
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/bill@ponostyle.com =
<http://autox.team.net/mailman/options/fot/bill@ponostyle.com>
>=20
>=20
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">That rule of thumb doesn=E2=80=99t make a great deal of =
sense. There are two issues with oil that is changed frequently, as it =
usually is with racing engines. Low temperature means any water =
contamination won=E2=80=99t necessarily be driven off. If you exceed 212 =
degrees F with a vented wet sump engine most of the water will evaporate =
and vent. We have wet sleeve motors and iffy head gaskets=E2=80=94we get =
water in our oil. Mayonnaise doesn=E2=80=99t lube all that =
well. <div class=3D""><br class=3D""></div><div class=3D"">If oil =
temperature exceeds 290 it starts to oxidize faster. Wet sump motors =
with moderate control over the crankcase oxidize oil pretty quickly. =
Frequent changes manage that, so who cares. Also above 290 we start =
seeing viscosity, and more importantly, film thickness decrease. Plain =
bearing motors and cams with plain followers like a thicker =
film. </div><div class=3D""><br class=3D""></div><div class=3D"">So =
more than 212 and less than 290 seems wise, and probably less than 270 =
just to be conservative. But definitely more than 212</div><div =
class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Feb 9, 2016, at 1:05 PM, Bill Tobin <<a =
href=3D"mailto:william.tobin31@verizon.net"; =
class=3D"">william.tobin31@verizon.net</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" =
class=3D""><font size=3D"2" face=3D"Arial" class=3D"">Hi Gang, there is =
a nice writeup about John Morton in the March edition of Sportscar, =
the SCCA magazine. He was at the Jefferson 500 last spring and seemed =
like a cool guy. I bought his book, complete with =
autograph.</font></div><div style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: =
rgb(255, 255, 255);" class=3D""> </div><div style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
face=3D"Arial" class=3D"">Also regarding oil coolers; a friend who's =
been racing since '66 told me as a rule of thumb the oil temp should be =
about 30 degrees above water temp.</font></div><div style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
face=3D"Arial" class=3D"">Also you can make up braided hoses rather =
easily yourself. Pegasus has a good description on how to do it in their =
catalog, along with a good selection of hoses and =
fittings.</font></div><div style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: =
rgb(255, 255, 255);" class=3D""><font size=3D"2" face=3D"Arial" =
class=3D"">NFI.</font> </div><div style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; orphans: auto; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; widows: =
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255);" class=3D""><font size=3D"2" =
face=3D"Arial" class=3D"">Cheers, Bill</font></div><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
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orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); =
float: none; display: inline !important;" =
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